Abrading, polishing, and buffing device



Dec. 28, 1937. w; BAUCH 2,103,444

ABRADING, POLISHING, AND- BUFFING DEVICE Filed June 23, 1937 INVENTOR.

ATTORNEYS.

Patented Dec. 28, 1937 UNlTED STATES PATENT OFFICE annanmc, POLISHING, AND BUFFING .DEVICE William H. Bauch, Sheibyvillc, Ind.

Application June 23, 1937, Serial No. 149,881

P 6 Claims.

amelled surfaces and the bufiing of metallic surfaces requiring a high polish.

One object of the invention is to provide a device of this character which may be easily manipulated by-hand and in which the internal friction, and hence the power required, and weight of the motor, is reduced to a minimum.

Another object is generally to improve upon the constructional details of devices of this character.

Other objects and features of the invention will be understood from the accompanying drawing-and the following description and claims:

Fig; '1 -is an elevational view with parts cut away and other parts shown in section of a preferred form of the invention. Fig. 2 is a plan view with parts removed and other parts shown in section. Fig. 3 is a vertical sectional view taken substantially on the line 3--3 of Fig. 1. Fig. 4 is a plan view of a reciprocating element and associated parts. Fig. 5 is a plan view of parts used for the attachment to the device of abrading or polishing elements.

In the preferred form of the invention shown in the drawing by way of illustration, the frame of the machine includes a box-like structure having an upper member III, a lower member H and end members l2 suitably secured together to form an enclosed chamber l3. A casing I4 is secured to the top of the member ill by suitable screws and forms a second enclosed chamber l5. A handle l6 secured to the top ofcasing l4 and to the member ID serves for moving the device over a surface to be abraded or polished. A knob l1 secured to the casing It serves as a hand grip for guiding the device. A fractional horsepower electricmotor I8 is mounted on the top of the casing l4 and drives a shaft iii to which there is secured a pinion meshing with gears 2i and 22, which are rotatably mounted on the undersurface of the casing It by means of pins 28- The gear 2i carries an eccentrically positioned crank pin 24 in turn carrying a roller 25. The roller 25 engages a channel shaped member 26 which is secured to a siidable member 21 resting upon the upper surface of the box member l0. The sliding member 21 and the channel member 26 are provided with noncircular openings engaging the non-circular end of a stud 28. i

The gear 22 is provided with an eccentrically positioned crank pin 29 which is connected by means of a link 30 to a pin 3|. The pin 3| is provided with a tongue 32 engaginga groove in the upper end of a stud 33. Each of the studs 28 and 33 is secured to one of a pair of reciprocating members 34 within the box-like frame. Each of said studs projects through a suitable slotted opening in the member Ill and is thus free to reciprocate. A pair of plates 35 which are provided with openings closely fitting the studs 28 and 33 reciprocate with said studs and close the openings in the member l0 through which said studs project; Each of the reciprocating members 38 carries on its upper surface a pair of channel-shaped guideways 3G and similar guideways 31 are carried by the undersurface of the box member I0. Anti-friction rollers .38 travel in said guideways v and are carried by pins 39 supported in a frame consisting of longitudinal bars 40 and cross members 4|. Each of the studs 28 and 33 is surrounded by a block 42 of soft rubber or other suitable material which is adapted to engage the cross member 4| and to prevent undesired overtravel of the rollers 38 and their associated frames. The undersurface of each of the reciprocating members 34 is provided with a plurality of bosses 43, preferably three in number, arranged as best seen in Fig. 4. Said bosses project downwardly through slotted openings 44 in the lower box member II and have secured thereto by means of suitable screws a'pair of plates 45, each ofsaid plates forming part of the base of a rec iprocating working, element indicated generally in the drawings by the reference number 46. The openings 44 are covered within the chamber l3 by plates 41 which are provided with suitable openings closely fitting the bosses 43 and, therefore, reciprocable therewith.

The base plates 45 have secured thereto, by suitable screws, base plates 48, said plates being formed as best seen in longitudinal section in Fig. 1 and in transverse section in Fig. 3. The ends of said plates terminate in downwardly extending portions 49 having an outwardly concave formation. The sides of said plates are provided with downwardly turned ears 50. The downwardly turned portions 49 of said plates form a guideway for a detachable dovetailed backing member 5| having a central recess 52 in which there is secured a leaf spring 53. The upper edges of the leaf spring engage the ears and normally latch the dovetail piece 5! in the position shown in the drawing. However, by inserting a suitable tool between the ears and upon the surface of the article to be operated upon pressing one end of said spring downwardly, it

may be freed from said ears and the dovetail member ll may be withdrawn. Secured to the Iundersurface of the member ii there is a mat I4 preferably formed of sponge rubber or other suitable material, depending upon thework to be done. About said mat there is trained a sheet II of whatever material is to be used in contact with the work. The sheet Il may be sandpaper, emery cloth, polishing cloth, chamois skin or other suitable material, The upper edges of said sheetengage the concavity in the members 48 and are retained therein by rollers II, which are in turn resiliently held in place by tension springs II secured to the ends thereof. Because of the detachable construction of the backing member and the hands of the operator grasp the handle I and the knob l1. Power is supplied to the motor II from any suitablesource of electricity by a flexible cable 58 and is controlled-by a snap switch 88. When power is supplied to the motor II, it rotates the shaft 19, pinion 20 and gears 2| and 22. By means of their crank pins and associated parts, said gears cause the reciprocation of the members 34 and the working members 4'. This reciprocation alternately moves the members 46 toward and away from each other. The weight of the device and the downward pressure supplied by the operator is transmitted from the box member in through the guideways 31, rollers "and guideways 36 to the reciprocating member 34 and thence through the bosses 43 to the working members 46 and the sheet 55 of the working material. This weight or pressure, therefore, is transmitted through no sliding contact of any kind, the rollers II providing anti-friction transmission of the force from the relatively stationary portion of the device to the reciprocating portions thereof. Since these rollers operate in a chamber which is closed in a substantially grease-proof manner by plates 45 and 41, an adequate supply of lubricating material may be constantly maintained thereon. Aside from the small friction of the moving parts, the only power which need be supplied by the motor II is that necessary to overcome the friction of the working members 46 upon the work itself. The motor may, therefore, be of relatively small power and correspondingly light weight. This construction results in a device which is easily transported and manipulated by the operator.

The foregoing specification describes a preferred form of the invention, the detailsof which may be varied within wide limits without departing from the scope thereof as defined by the appended claims.

Ihe invention claimed is:

1. In a device of the class described, a box-like frame structure having openings in its upper and lower faces, a reciprocable member therein having parts projecting through said openings, power means connected to an upper projecting part for bearing members interposed between said reciprocating member and the upper wall of said frame structure.

2. In a device of the class described, a box-like frame structure having openings in its upper and lower faces, a reciprocable member therein having parts projecting through said openings, power means connected to an upper projecting part for reciprocating said member, a working element secured to at least one lower projecting part and reciprocable thereby, rollable anti-friction bearing members interposed between said reciprocating member and the upper wall of said frame structure, and guard members movable with said projecting parts and closing said openlugs to make a substantially grease-tight compartment within said frame.

\ 3. In a device of the class described, a box-like frame structure having openings in its upper and lower .facesand having a guideway on the inner side of its upper face, a reciprocable member therein having parts projecting through said openings and having a guideway on its upper surface, power means connected to an upper projecting part for reciprocating said member, a

working element secured to at least one lower projecting part and reciprocable thereby, and

rollable anti-friction bearing members interposed between said guideways.

. 4. In a device of the class descibed, a box-like frame structure having openings in its upper and ings interposed between said reciprocating members and the upper wall of said frame structure.

5. In a device of the class described, a boxlike frame structure having openings in its upper and lower faces, a pair of reciprocable members therein having projections extending through said openings, power means connected to an upper extension of each of said members and adapted to move the same alternately toward and away from each other, a working element secured to at least one of the lower projections of each of said members, rollable antifriction bearings interposed between said reciprocating members and the upper wall of said frame structure, and guard members movable with said projecting parts and closing said openings to make a substantially grease-tight compartment within said frame.

6. In a device of the class described, a boxlike frame structure having openings in its upper and lower faces and having a guideway on the inner side of its upper face, a pair of reciprocable members therein having projections extending through said openings and each having a guideway on its upper surface, power means connected to an upper extension of each of said members and adapted to move the same alternately toward and away from each other, a working element secured to at least one of the lower projections of each of said members, and

rollable anti-friction bearing members interposed between said guideways.

, WILLIAM H. BAUCH. 

